二尖瓣狭窄咯血的原因除外() ["肺水肿","支气管黏膜微血管破裂","肺栓塞","支气管静脉曲张破裂","支气管动脉破裂"]
一位脑外伤病人,伤后即进入深昏迷,双侧瞳孔极度缩小,四肢瘫痪,高热,呼吸障碍,最可能的诊断() ["颅内血肿","原发性脑干损伤","下丘脑损伤","小脑挫裂伤","脑室出血"]
通常照片铅字标记应置于暗盒边缘内() ["0.5cm处","1.0cm处","1.5cm处","3cm处","5cm处"]
潜伏期平均约需() ["6小时","8小时","10小时","12小时","16小时"]
有顶盖的架空通廊,按通廊的()计算建筑面积。 ["投影面积","投影面积的1/2","顶盖的投影面积","顶盖投影面积的1/2"]
钢和铁的主要区别是什么?